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(No Model.) 2 Sheets-Sheet 1.

J. H. MOORE.

AIR GOMPRESSING PUMP.

No. 534,340. Patented Feb. 19, 1895 FMS].

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J. H. Moon. AIR GOMPRESSING PUMP.

No. 534,340. v Patented Feb. 19, 1895.

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UNITED STATES PATENT OFFICE.

JAMES H. MOORE, OF CRYSTAL FALLS, MICHIGAN, A SSIGNOR TO THE GENE'IT AIRBRAKE COMPANY, OF SAME PLACE.

AIR-COMPRESSING PUMP.

SPECIFICATION forming part of Letters Patent No. 534,340, dated February19, 1895. Application filed November 3, 1391. Serial No. 410,804 (Nomodel.)

To all whom it may concern:

Be it known that I, JAMES H. MOORE, of

Crystal Falls, in the county of Iron and State of Michigan, haveinvented a new and useful Improvement in Air-Compressing Pumps, of

which the following is a specification.

My invention consists in an improvement in air compressing pumps,particularly intended for use in air brakes where the pump :0 is drivenfrom an axle instead of an independent steam engine, and is hereinafterfully described and claimed.

Figure l is a sectional end elevation of the pump, without the cylinderhead or piston. Fig. 2 is a side elevation of the pump with thegoverning cylinder and one of the suction valves in section. Fig. 3 isan inside elevation, and Fig. 4 is an edge elevation of one of thecylinder heads. Fig. 5 is a top plan View. 0 represents an ordinary pumpcylinder, provided with a piston having an ordinary piston rod P, and across-head 19 working on a fixed guide Q, to keep the piston rod inline. M M represent the chambers of the suction 2 5 Valves, which arecast on one side of the cylinder, and are each closed by a screw-cap I,and contain an ordinary puppet valve L, as clearly shown in Fig. 2. Fromthese valve chambers ports Zlead to the interior of the pump cylinder,but instead of connecting directly therewith, they connect with smallports 'n, formed in the inside of the two cylinder heads, as clearlyshown in Figs. 2, 3, and 4, whereby no clearance of the piston isnecessary, and the piston may be run close to the cylinder head, theobject of this being to avoid compressing air uselessly, On the sameside of the pump with the two suction valve chambers M is cast or formedor bolted 40 a governing cylinder E, closed at one end by a cap R and atthe other end by cap R. The upper end of this cylinder is bored outsmaller than the lower end, and in it fits loosely a piston or plungerF, carrying a piston stem or rod G, which projects through a cap K incap R.

The rings D D may screw into cylinderE and between the rings D and D issecured a diaphragm, 0, closing the cylinder E under the plunger F.

J represents a spiral spring encircling the piston-rod G, abutting atone end against plunger F, and at the other end against cap K andtending normally to press the plunger F against the ring D. By turningthe cap K, the tension of the spring J can be regulated to resist anydesired pressure on diaphragm O.

H represents a U-shaped yoke or crosshead carried on piston-rod G, withits ends under the suction valves L, so that when said yoke orcross-head is forced upward, it unseats both suction valves and holdsthem open.

B B represent two discharge valves which can be placed anywhere upon thecylinder, but which, for ease in casting, are shown as placed upon theside of the cylinder opposite that on which the suction valve chambers Mare formed. The ports Z of the discharge valves B connect with the portsn in the inside of the cylinder heads N N, as do the ports Z of suctionvalves L, and for the same reason.

A represents the discharge port of both discharge valves B, which may bean independent pipe connecting both valves, or may be formed in the wallof the cylinder 0, opening into a port A common to both valves B asindicated in Fig. 1, and this port A opens into cylinder E belowdiaphragm C.

a represents a passage through cap R, leading to any suitable reservoirfor compressed air (not shown in the drawing).

The operation of my invention is as follows:

If it is desired to carry an air pressure of say twenty-five pounds persquare inch in the reservoir, the spring J is compressed so that it willresist a pressure of anything less than twenty-five pounds tothe squareinch on diaphragm C. When the'pump is set in motion,

all the valves will operate in the ordinary 9o manner of a double actingpump, until the air pressure in cylinder E in the reservoir equalstwenty-five pounds, when the diaphragm C will be forced upward, carryingwith it plunger F, piston-rodG, and yoke or cross-head H, 5 and throughthe medium of said yoke or crosshead will unseat both suction valves andhold them open so that air will be alternately'drawn in and forced onthrough said valves without passing through the discharge valves B. This[00 will continue until the pressure of the cylinder E falls beolwtwenty-five pounds, when the spring J will return plunger F to theposition shown in Fig. 2, and permit the pump to begin again compressingair.

The arrangement of the mechanism which I have herein shown simplifiesand cheapeus the mechanical construction now obtaining in pumps of thisclass, and unseats the suction valves L in a right line, avoiding theslight tilting which isliable to occur when they are unseated by theaction of the pivoted levers.

hat I claim as my invention, and desire to secure by Letters Patent, is

1. In an air compressing pump a governing cylinder connected with thedischarge port, a diaphragm within said cylinder, a spring resisting themotion of said diaphragm, a piston having a stem, and a rigid yokedirectly connected to the stem of the piston and having projectionslocated directly under the suction valves so as to unseat them,substantially as and for the purpose set forth.

2. The combination with the suction and discharge passages of a forcingpump, and a valve controlling the suction passage, of a piston locatedbelow and adapted in its upward movement to engage said valve, a springto normally hold the piston out of engagement with the valve, andsuitable connections leading from the discharge passage to the underside of the piston to convey pressure to the piston and lift it intoengagement with the valve, substantially as described.

3. The combination with the suction passage and its valve, of agoverning cylinder connected with the discharge port, a diaphragm withinthe cylinder, a piston arranged between the diaphragm and valve andadapted to directly engage the latter, and a spring to hold the pistonnormally out of engagement with the valve, substantially as described.

' JAMES H. MOORE.

Witnesses:

MOSES L. RoTHscHILD, GERTRUDE H. ANDERSON.

